:root{--bg:#fff;--fg:#1f2933;--muted:#5f6b7a;--line:#e3e8ee;--accent:#1d4ed8}
@media (prefers-color-scheme:dark){:root{--bg:#10151c;--fg:#e6ebf1;--muted:#9aa7b5;--line:#243040;--accent:#7aa7ff}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}
main{max-width:760px;margin:0 auto;padding:32px 16px 64px}
header{border-bottom:1px solid var(--line)}
header .in{max-width:760px;margin:0 auto;padding:16px;display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.brand{font-weight:700;letter-spacing:.08em;color:var(--fg);text-decoration:none}
nav a{color:var(--muted);text-decoration:none;margin-left:16px}
h1{font-size:2rem;line-height:1.2;margin:0 0 8px}
h2{font-size:1.25rem;margin:32px 0 8px}
p,li{color:var(--fg)}
.sub{color:var(--muted);margin:0 0 24px}
a{color:var(--accent)}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:10px 18px;border-radius:8px;text-decoration:none;font-weight:600}
@media (prefers-color-scheme:dark){.btn{color:#10151c}}
footer{border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}
footer .in{max-width:760px;margin:0 auto;padding:16px}